7X Parts for sale

maasfh wrote:

I have a 7X block (no serial number) and does not appear to have been milled on the intake & exhaust ports. Letters still on the valve cover ledge.

and 7X exhaust manifold that has been blasted and jet coated. $2900.00

Can machine prepare for assembly--your option for additional $. Pickup or will ship. Shipping additional charge. Now is your chance for a correct 7X motor.



Randy Maas

309-267-6158

All replacement engines in 1956 engines were 7x blocks. 30 over bore, 10 under rods and mains. The dealers when replacing an engine were supposed to install the engine number from the engine they replaced, most did not. The letters stamped on the valve cover ledge is the size of the piston in the bore. Marks meant 1 to 5 thousand over size. In this case 30 + 1 to 5. All Hudson engines are marked this way so if a piston had to be replaced you gave them that letter. It's all in the Hudson manuals all years. Walt.

dougson wrote:

Walt,



Please clarify. What exactly was "replacement engines in 1956 engines"? Are you saying that all '56 blocks were same as 7X? Or was there a specific replacement block for '56 engines that was actually a 7X, and machined for the bigger valves. I've been under the impression, and my '56 block bares this out, that all '56 blocks were essentially 7X blocks without the "finishing" work and larger valves. They have the deep valve reliefs, 1/2" drilled head bolts, improved cooling, and standard twin-H in the Hornet.

First, no engine was available with bigger valves. All 56 engines are 30 over and 10 under mains and rods. Sears was selling these engines from 56 to 60 for $325.00. Yes, they have the deep valve relief, 1/2 inch head bolts and the water thermostat housing was modified to eliminate the by pass. Second series 55 started with these engines. This was the block you received when a 7x was ordered, but had to go to a special garage or the dealer installed the parts after he received the car. This was an extra cost and you did not get the parts that were taken off. Walt.

Walt,

I have to disagree with you on the content of the block casting. I had metal shavings from both a 1953 and my 1956 308 tested and they both came back as the same alloy material. they were identical to a t in alloy content. the 55 and 56 blocks were cast from the same material as the early engines not regular cast iron.

later,

PaceRacer50

If I still have the reports I will but they are lost along with my information I had for all the modifications I did to my present engine. Some place in my filing cabinet (the basement) is where they reside.

I had a friend that works for a major diesel engine mfg. here in the state of Indiana get the metallurgical analysis done as a "side project".... if I ever do find these reports I'll make sure that I mark out the names and parties just like Uncle Sam does....

later,

PaceRacer50

the 1956 Hudson 308 engine I have did not come out new in a car from the factory. We believe it was bought from J.C. Whitney as a replacement because it was set up with a stepped flywheel for the early transmission, had hydraulic lifters with the 742 cam, intake and exhaust manifold were single 2bbl but with the exhaust manifold flanges just like the early pre 1955 engines.

the serial number stamped in the pad next to the edge of the headgasket surface on the deck is way above any number the guys here in the Hudson club in Indiana has ever seen. The engine was .020 overbore, had .010 rods and mains with this information stamped into one of the ribs in the 262 cylinder head that came with the engine along with the date of Feb of 1964. It was so clean inside that there was no carbon in the combustion chamber of the head at all and the hone in the cylinders was fresh.

The analysis of this cast iron along with a chunk of a 1952 Hudson 308 block I got from a friend from down south took place in the city of Columbus where some of the best diesel engines in the world are made. I did not tell my friends in Columbus what mfg these metal shavings came from but the ones from my engine came from the intake & exhaust ports along with the relief area. The earlier 308 was a chunk of lower block and part of a cylinder that we shaved in the bridgeport. I believe I had close to 3lbs of material from each engine.

They wanted to know just what kind of engine that this material came from as they had never seen a gas engine use an alloy of this nature.

I did not put hardened seats in the 56-308 I am running. the head has been off twice to check things out. Taking accurate measurements of the valves closed there has been no sinking of the seating surface at all. Granted I am not driving on cheep pump gas 200,000 miles but running 118 octane racing fuel with 4-5lbs of boost from the supercharger is putting a large amount of stress on this old 308.

I do know that this block was not cast in Wisconsin as it has the CWC foundry casting logo in the side exactly as the 1952 engine had.

I do not doubt that there has been problems with seats sinking in any of these older engines when run for a lot of miles on the grades of gas we have now. I have seen it in other engines and even engines with hardened seats installed. I believe it depends on how you drive them, how rich or lean they are tuned, how hot they run, ignition advance curve, what type of valves are used on the exhaust side during the rebuilds and a lot of other issues.

I had custom high temperature exhaust valves made for this engine for turbocharged racing engines and used stainless steel intake valves both custom made by Manley. The exhaust valves look like I just took them out of the box and installed them when I had the head off 6 weeks ago. Right now I have 2800 miles with over 1/3 of that at the drag strip on this engine.

All I know is that if this was soft cast iron I ported, polished and relieved and how many carbide cutters (26 to be exact) I went through during the 3-1/2 weeks it took me to do all 12 ports & 6 reliefs I would really hate to port one of these 308 Hornet engines with the Alloy blocks......

later,

PaceRacer50

maasfh wrote:

Hi Walt,



Now you have me confused. You state "There were no 7X blocks from Hudson". Then in a following sentence you state "When you ordered a 7X

---

" Can you clarify? Were there different years you could get one and later years not?



Randy

When you ordered a 7X, the engine was shipped to the dealer and he had to change the parts or you could have the factory service garage do the work and you did not get any parts back that were replaced. INSURANCE PROBLEM. Walt